Final answer:
The League of Nations aimed to promote world peace but failed due to its lack of enforcement power, which was evident when it could not stop aggressive actions by Japan, Germany, and Italy in the 1930s.
Step-by-step explanation:
The purpose of the League of Nations was to establish a global intergovernmental organization dedicated to promoting world peace and collective security. Its primary goal was to facilitate good relations among countries and deter aggression. However, it failed because it had no enforcement power. Without a military force and lacking full cooperation from member nations, the League was unable to effectively carry out its rulings.
The absence of the United States, as it never ratified the Treaty of Versailles, further weakened the League's influence. High-profile acts of aggression by Japan, Germany, and Italy in the 1930s, such as the invasions of Manchuria and Ethiopia, demonstrated the League's inability to respond effectively, often managing little more than issuing condemnations and imposing sanctions that were not universally upheld.